永磁同步电机转矩脉动抑制方法

分数槽集中绕组永磁同步电机被广泛用于伺服控制系统。由于电机极槽配合以及制造过程中机械加工与装配误差等因素,所以永磁同步伺服电机输出转矩中会存在固有的周期性转矩脉动,影响伺服系统实现高精度的速度与位置跟随。因此,采用转矩观测器来估计由上述原因造成的转矩脉动,再将转矩脉动与位置信号通过一定处理,计算出相应的前馈转矩电流,补偿到电流指令端,对转矩脉动进行抑制,从而减小转速脉动。通过仿真和试验验证了抑制方法的有效性。

Torque Ripple Control Method for Permanent Magnet Synchronous Motor

In recent years, permanent magnet synchronous motors with concentrated winding and fractional slot had been widely used in servo control systems. Cyclic torque pulsation, which was detrimental to the speed and position regulation of a high performance servo system, existed in such type of motors due to poleslot combinations and imperfections in manufacturing such as mechanical errors introduced during parts machining and assembly. Therefore, an observer based torque ripple estimation and mitigation scheme was developed. Torque observer was adopted to estimate the torque ripple, and then torque ripple and position signal were processed to calculate the corresponding compensation torque current, which was in turn fedforward to the current command to suppress the resultant speed pulsation. Simulation and experiment results were obtained to verify the effectiveness of this method.